efi_loader: capsule: fix SIZEOF_MISMATCH warning

CID 316361 says:
> Passing argument "count * 8UL /* sizeof (*files) */" to
> function "dlmalloc" and then casting the return value to "u16 **" is
> suspicious. In this particular case "sizeof (u16 **)" happens to be equal
> to "sizeof (u16 *)", but this is not a portable assumption.
> > 767         tmp_files = malloc(count * sizeof(*files));

The change in this patch fixes the ambiguity.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Fixes: CID 316361
For readability use *tmp_files instead of tmp_files[0]
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/lib/efi_loader/efi_capsule.c b/lib/efi_loader/efi_capsule.c
index dad1b0f..0d5a7b6 100644
--- a/lib/efi_loader/efi_capsule.c
+++ b/lib/efi_loader/efi_capsule.c
@@ -764,7 +764,7 @@
 		goto err;
 
 	/* make a list */
-	tmp_files = malloc(count * sizeof(*files));
+	tmp_files = malloc(count * sizeof(*tmp_files));
 	if (!tmp_files) {
 		ret = EFI_OUT_OF_RESOURCES;
 		goto err;